2Mhz = period of 500 nS. that's well within TTL realms - even obsolete 7400 series logic. 74ALSxx, for example has a typical propagation delay of 4-5 nS per...
7799
Scott Thompson
blueelectron9
Dec 30, 2003 10:22 pm
Sorry, but the gates I suspect you'll use will have about 20ns delay. A 2ps square wave at 50% duty cycle is 500 GHz. A pico second is 10e-12 seconds. If...
7800
Scott Thompson
blueelectron9
Dec 30, 2003 10:32 pm
How do you know how long the segment is going to be? If you have an input stream of unknown length, then how do know where the segments are? One way would be...
7801
kmmath@...
coiltap2003
Dec 30, 2003 10:49 pm
Many vehicles today use a "smart" variable reluctance sensor to detect rotational speed of either a vehicle crank or camshaft. The "smart" 3 wire variety you...
7802
Dave Mucha
dave_mucha
Dec 30, 2003 11:22 pm
... The truth is I have no idea. It may very well be that when I am tripping at low currents, it will trip 8-10 times in a segment, and at a high amp, it will...
7803
Phil
phil1960us
Dec 30, 2003 11:45 pm
thanks. worth checking on. what sized teeth do those gears have? I ask because the servo gear teeth are really small and plastic. The servo is like 50 mm x...
7804
MUSIBIKE@...
musibike
Dec 31, 2003 12:12 am
Is it a SWITCHING powersupply? A front end bridge supplies raw DC for a FET or something to load that transformer up with a B-field. Probabily a FLYBACK...
7805
MUSIBIKE@...
musibike
Dec 31, 2003 12:15 am
Hey STEVE Po=Pi*n Po is always less than Pi. Otherwise we would have propetual motion machines. ... MUSIBIKE...
7806
kmmath@...
coiltap2003
Dec 31, 2003 12:40 am
Plastic teeth will NOT work. Another option if you only need one pulse/rev, and the unit is contained from sunlight, you may want to consider an opto coupler....
7807
sd60mconrail
Dec 31, 2003 12:51 am
Hello, I am a model railroader and I need some help of a simple circuit for the model RR I am working on. I cannot design circuits but I can build them from a...
7808
Michael Casino
michaelcasin...
Dec 31, 2003 1:17 am
Lavon; Take a look at this page: http://dmoz.org/Recreation/Models/Railroad/Projects/ Mike Casino <snip> Hello, I am a model railroader and I need some help of...
7809
Phil
phil1960us
Dec 31, 2003 1:36 am
I'd prefer a quadrature encoding scheme and preferably not on the output gear. The problem with an interrupter scheme is that I need to access 2 sides of the...
7810
Steve
alienrelics
Dec 31, 2003 1:37 am
I -did- say: Watts In = Watts Out x efficiency Alien Steve ... wrote: ... ......
7811
Steve
alienrelics
Dec 31, 2003 1:45 am
I was waiting for someone else to correct you about fridge magnets. They are arranged NSNSNSNS with only a 1/4 inch or less between poles. That big strong...
7812
Phil
phil1960us
Dec 31, 2003 2:22 am
OK, thanks. More like 1/8" in the one I have. I've read several appnotes on different ways to use them but dont think I can put enough iron on the servo based...
7813
manifold
manifold_1
Dec 31, 2003 4:29 am
It looks like some threads are crossed here. The poster for hum in the transformer is not the same as the smps poster. An switching supply is a different...
7814
Chris Wardell
cwardell2000
Dec 31, 2003 4:40 am
I just finished the first phase of a controller for my new robot and it passed the "blinky light test". It seems that no matter how much of this stuff you do...
7815
jaelle
igneous_vitriol
Dec 31, 2003 5:35 am
I've built a nice little mic preamp to boost mic signals to line level for my sound card, but it runs on a nine-volt battery. I would like to run it on the pc...
7816
Steve
alienrelics
Dec 31, 2003 7:37 am
The problem: Noise in the power supply. The solution: a low pass filter formed by a capacitor and the internal resistance of the power supply. But a computer...
7817
Dave Mucha
dave_mucha
Dec 31, 2003 2:05 pm
PC power supplies are switching and that means noise. You can spend a LOT of time and energy on filters, but it if was that easy, it would already be done. I...
7818
MUSIBIKE@...
musibike
Dec 31, 2003 4:05 pm
NO!! Not true. MUSIBIKE...
7819
MUSIBIKE@...
musibike
Dec 31, 2003 4:14 pm
Maybe you used a transformer with a bridge and just a filter cap. Try a series pass linear regulator transistor with a zener or a good regulator I.C. Sounds...
7820
MUSIBIKE@...
musibike
Dec 31, 2003 4:23 pm
You got the throry a bit wrong here bro. A machine that converts or does work losses a bit of the total input power as heat as it does its job. So, the total...
7821
jaelle
igneous_vitriol
Dec 31, 2003 6:44 pm
Thanks everyone! Dave's quick and dirty low-pass filter works beautifully--a 470uF cap and 110 ohm resistor has it as silent as a noise gate even at highest...
7822
jaelle
igneous_vitriol
Dec 31, 2003 8:28 pm
... Except it was Steve's--thanks again!...
7823
Dave Mucha
dave_mucha
Dec 31, 2003 8:56 pm
... a ... Try ... That ... a ... the ... place a ... input ... correctly! ... MIC ... level ... like to ... of ... null. I've ... large ... supplies? ... (I...
7824
MUSIBIKE@...
musibike
Dec 31, 2003 9:59 pm
I am glad it cleaned it up! Ralph MacDonald MUSIBIKE...
7825
Robert
rch427
Jan 1, 2004 5:17 am
I just bought an old transistorized combo organ. When I plugged it in and turned it on, I heard a number of small "tinkling"; and "ticking" sounds from inside...
7826
kmmath@...
coiltap2003
Jan 1, 2004 6:13 am
<SNIP>In a message dated 12/31/2003 9:18:38 PM Pacific Standard Time, rch427@... writes: How do I read these color stripes for values, ratings, etc.?...
7827
Scott T.
blueelectron9
Jan 1, 2004 7:55 am
I am looking for primary solid-state UV light sources (380nm) with high output (>100mcd @ 20mA) and a 30° viewing angle. UV-LED clusters are acceptable if...
